When activating the 'Valid Values' trigger our Validator (Xerces)
complains about the Node bound to QName as there's no namespace
defined for 'my:myelement' and therefore the prefix 'my' cannot be
resolved. The Node becomes invalid.
Declaring a namespace with that prefix fixes that problem in our
implementation. I think Xerces is right here as the QName validation
does not only test for lexical correctness of the QName but also
checks if there a namespace in scope for the given prefix.
Regards,
Joern